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Niels Henrick David Bohr (1885-1962)

He was a Danish physicist. In 1913 he published his explanation of how atoms, with electrons orbiting a central nucleus, achieve stability by assuming that their angular momentum is quantized.

Movement of electrons from one orbit to another is accompanied by the absorption of emission of energy in the form of light, thus accounting for the series of lines in the emission spectrum of hydrogen. For this work Bohr was awarded the 1922 Nobel prize.

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